In the following question, four words are given out of which one word is correctly spelt. Select the correctly spelt word.
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Who invented the bifocal glasses?
Who won Nobel prize for Physics in 2015?
To whom the Nobel Prize in Physiology or Medicine 2016 was awarded?
Who was the first to score a perfect 10 in Olympics in gymnastics?
What is the pH value of human blood?
There are 15 protons and 22 neutrons in the nucleus of an element. What is its mass number?
Which city is located on the banks of the river Alaknanda?